Some Help and explanation with differing nut widths on RW necked LIII

Been struggling for some time with one of my LIII’s – its a very very early LIII in Olive Gold with the Rosewood Neck – it was one of the very 1st into the UK and I have loved it..

However, I have since bought a Roasted Maple HSS LIII and and Axis and both have made me realise that the HH is actually a pretty hard ride at times – I had always put it down to what I thought what a different fret profile – it feels very much like it has tiny vintage style frets on it.

However, getting my measuring calipers out at the weekend to help a friend chose which EBMM he should go for I had a shocking discovery – this OG HH model’s width at the nut is 3mm LESS than the other 2 EBMM’s I have – 38.5mm at the Nut, 52.5mm at body end (HSS is 41.5mm Nut, 56mm at body)

The frets are actually all the same profile – its just the width of the neck makes it feel a little different.

Was this a feature of the very 1st LIII’s and is it one of the reasons why it was ditched by Luke (I know about the whole touring/seasonal change thing he gave as the reason a few years back).

I have also checked with another friend who has a similar age HH with Rosewood (in Black) and the neck profile/width on that matches the wider HSS exactly.

Why does this guitar have such a narrow neck profile?